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arXiv 2301.02765quant-phcond-mat.mes-hallcond-mat.str-elcond-mat.supr-con
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乘法 Majorana 零模

Multiplicative Majorana zero-modes

Adipta Pal, Joe H. Winter, Ashley M. Cook

AI总结:

本文提出乘法 Majorana 零模,证明乘法拓扑相可固有承载四个未配对零模并形成最大纠缠 Bell 态,为以拓扑相变替代编织的门操作方案提供基础。

摘要:

由未配对 Majorana 零模组成的拓扑量子比特,在实现实用量子计算方案的努力中正受到实验和理论方面的密切审视。在本工作中,我们表明,按照编织方案以及对用于门操作的纠缠控制,一个拓扑量子比特所需的最少四个未配对 Majorana 零模,是乘法拓扑相所固有的;这些拓扑相实现了由对称性保护的未配对 Majorana 零模张量积——以及最大纠缠 Bell 态——即所谓的乘法 Majorana 零模。我们将乘法 Majorana 零模介绍为一维和二维乘法拓扑相的拓扑保护边界态,并采用依赖于乘法拓扑的方法,从 Kitaev 链模型构造相关 Hamilton 量。此外,我们在使用既有方法刻画体相和边界拓扑的同时,还引入了一些技术以克服刻画乘法拓扑时的挑战。在此过程中,我们探索了这些乘法拓扑相作为基于编织的拓扑量子计算方案之替代方案的潜力;在该替代方案中,门操作通过拓扑相变来执行。

英文摘要:

Topological qubits composed of unpaired Majorana zero-modes are under intense experimental and theoretical scrutiny in efforts to realize practical quantum computation schemes. In this work, we show the minimum four \textit{unpaired} Majorana zero-modes required for a topological qubit according to braiding schemes and control of entanglement for gate operations are inherent to multiplicative topological phases, which realize symmetry-protected tensor products -- and maximally-entangled Bell states -- of unpaired Majorana zero-modes known as multiplicative Majorana zero-modes. We introduce multiplicative Majorana zero-modes as topologically-protected boundary states of both one and two-dimensional multiplicative topological phases, using methods reliant on multiplicative topology to construct relevant Hamiltonians from the Kitaev chain model. We furthermore characterize topology in the bulk and on the boundary with established methods while also introducing techniques to overcome challenges in characterizing multiplicative topology. In the process, we explore the potential of these multiplicative topological phases for an alternative to braiding-based topological quantum computation schemes, in which gate operations are performed through topological phase transitions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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